In a chilled bowl with chilled beaters, whip the cream until thickened. Beat in the sugar and the vanilla, continue beating until stiff peaks form. Do not over beat.,______,In a glass trifle dish or individual dessert dishes, alternately layer the strawberries mixture, cake cubes, whipped cream, and the custard sauce (if using).,Top with whipped cream and decorate with several of the choicest berries.,Serve immediately, or cover and chill until serving time. Best if eaten the same day.